Stack Migrations & Framework Upgrades
Safely upgrade to Next.js App Router, NestJS, TypeScript, or modern databases with zero downtime.
Fixed milestone scope • No hourly surprises • Direct GitHub delivery
For massive legacy applications migrating to microservices, modern Server Components, or new database engines.
Why Typical Approaches Fail & How We Engineer It
Real engineering discernment: diagnosing root failure modes and engineering resilient solutions instead of generic AI wrappers.
Old Next.js Pages router apps, un-typed Express monoliths, and sluggish Prisma schemas slow down your developer velocity, inflate bundle sizes, and prevent adopting modern React 19 Server Components.
We execute phased, zero-downtime migrations. We decouple routes incrementally, convert raw queries to type-safe Drizzle ORM schemas, introduce strict TypeScript types, and verify every migration with automated regression tests before production cutover.
Technical Architecture Blueprint
[Legacy Monolith (Pages Router / Express / Raw SQL)]
│
▼
[TypeScript Strict Mode & Schema Mapping] ──▶ (Drizzle ORM Type Defs)
│
▼
[Dual-Route Phased Extraction] (Server Components + App Router)
│
▼
[Parallel Shadow Testing] (Verify Output Parity with Legacy Routes)
│
▼
[Zero-Downtime Production Cutover] ──▶ (40%+ Bundle Size Reduction)Exact Deliverables & Scope
Clear scope boundaries eliminate surprises. Here is exactly what is delivered in a standard sprint versus what is handled under custom scope.
- Migration of up to 10 core routes or API endpoints to modern App Router
- Database schema porting to Drizzle ORM with verified migrations
- Bundle analysis and removal of deprecated dependencies
- Post-migration verification testing
- •Complete multi-thousand file enterprise repository migrations
- •Migrating between entirely different database engines (e.g. MongoDB to PostgreSQL)
Technologies Implemented in This Service
How This Sprint Is Executed
Discovery & Code Audit
Understand your product goals, inspect your existing codebase or requirements, and define a clear milestone roadmap with fixed deliverables.
Rapid Prototype & Validation
Build and validate a working prototype or targeted fix to test assumptions, AI response quality, and API contracts early with your team.
Implementation & Hardening
Refine business logic, implement caching and error handling, optimize database queries, and test edge cases thoroughly with regression tests.
Production Handover & Support
Deploy to production, integrate with your existing stack, and provide complete documentation, tests, and code walkthroughs.
Frequently Asked Questions About This Sprint
Will our users experience downtime during the migration?
No. We use phased rollout strategies and parallel validation on staging, ensuring zero downtime for live users during the cutover.
Why migrate from Prisma to Drizzle ORM?
Drizzle provides near-zero runtime overhead, compiles to raw SQL queries without heavyweight Rust binaries, and executes queries up to 4x faster on serverless platforms like Neon and Vercel.
Ready to Build Stack Migrations & Framework Upgrades?
Tell me about your tech stack and target timeline. I review requirements and provide a clear milestone scope within 24–48 hours.
Explore Related Engineering Services
Codebase Audit & Technical Roadmap
A comprehensive 3–5 day code audit, security check, and prioritized milestone roadmap with zero long-term commitment.
Codebase Rescue & MVP Fix-It Sprints
Rapid rescue for abandoned projects, ghosted developer handovers, and MVPs breaking under user load.
Add AI to Existing Products & SaaS
Embed custom AI chatbots, semantic search, and smart summarization directly into your current web app or SaaS.